A shockwave test system with an adaptive trigger threshold

DOI:	10.11809/bqzbgcxb2023.02.019
Keywords:	shockwave; Naiman Pearson criterion; signal to noise ratio; trigger threshold; acquisition and storage
Abstract:	Aiming at the situation in which medium and low trigger threshold settings are unreliable and trigger thresholds change frequently in a multi point distributed test when a storage shock wave test system is being used, this paper studies a shock wave signal test system with an adaptive trigger threshold. On the basis of analyzing the relationship between threshold settings and trigger probability, the system uses FPGA as the main controller, which can automatically calculate and set the low trigger threshold in power on initialization, and combine the accumulation of the number of triggers to form a double threshold to ensure the maximum effective trigger probability. In addition, the system uses SD Nand as the memory record chip, which improves the sampling bandwidth and storage efficiency of the existing storage shockwave system. The test proves that the test system can stably trigger acquisition and storage of weak shock wave signals from an explosion field, which has the characteristics of a high sampling rate, large storage capacity and high trigger reliability.
Published:	2023-02-28
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